Portable stage



FIG. 1 is top perspective view of the portable stage of the claimed design;

FIG. 2 is a bottom perspective view of the portable stage in a folded position;

FIG. 3 is a side view of the portable stage;

FIG. 4 is a front view of the portable stage;

FIG. 5 is a bottom view of the portable stage; and,

FIG. 6 is a top view of the portable stage. 

CLAIM I claim the ornamental design for a portable stage, as shown and described. 